I've stayed at all the resorts and here's the breakdown.
BWV, BCV, VWL are all 'hotel' type buildings with inside hallways.
SSR has no inside hallways. The 'hallways' are more like long balconies that extend along the back exterior of the building with entrances to the villas.
VB has inside type hallways for all rooms in the Inn portion. The beach cottages are each individual buildings and have their own private entrances. The 1-B/R, 2-B/R and Studio villas are multiple unit buildings, with 'hallways' similar to SSR in that they are outside the buildings, but more of inside a 'courtyard' area rather than a backside area such as SSR.
HH also has a lodge type building. Units there have both 'outside' hallways, and for a few off the elevator, a kind of 'semi-inside' hallway for very short sections. The other HH buildings are multi villa units, but there are no hallways. Instead there are common steps that lead up to the individual villas, with the entranceways at different locations on the steps.
OKW has only outside entrances, but it kind of a cross between HH and VB where there are steps going up to different 'balcony type' areas with some entrances very close to the steps, and others that you take for short distances down the 'balcony'.
Hope that helps.